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S3C2440X Datasheet(PDF) 62 Page - Samsung semiconductor |
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S3C2440X Datasheet(HTML) 62 Page - Samsung semiconductor |
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62 / 429 page  2003.09.25 Preliminary product information describes products that are in development, for which full characterization data and associated errata are not yet available Specifications and information herein are subject to change without notice. S3C2440X RISC MICROPROCESSOR NAND FLASH CONTROLLER 6-1 NAND FLASH CONTORLLER OVERVIEW In recent times, NOR flash memory gets high in price while an SDRAM and a NAND flash memory get moderate, motivating some users to execute the boot code on a NAND flash and execute the main code on an SDRAM. S3C2440X boot code can be executed on an external NAND flash memory. In order to support NAND flash boot loader, the S3C2440X is equipped with an internal SRAM buffer called ‘Steppingstone’. When booting, the first 4 KBytes of the NAND flash memory will be loaded into Steppingstone and the boot code loaded into Steppingstone will be executed. Generally, the boot code will copy NAND flash content to SDRAM. Using hardware ECC, the NAND flash data validity will be checked. Upon the completion of the copy, the main program will be executed on the SDRAM. FEATURES 1) Auto boot: The boot code is transferred into 4-kbytes Steppingstone during reset. After the transfer, the boot code will be executed on the Steppingstone. 2) NAND Flash memory I/F: Support 256Words, 512Bytes, 1KWords and 2KBytes Page. 3) Software mode: User can directly access NAND flash memory, for example this feature can be used in read/erase/program NAND flash memory. 4) Interface: 8 / 16-bit NAND flash memory interface bus. 5) Hardware ECC generation, detection and indication (Software correction). 6) SFR I/F: Support Little Endian Mode, Byte/half word/word access to Data and ECC Data register, and Word access to other registers 7) SteppingStone I/F: Support Little/Big Endian, Byte/half word/word access. 8) The Steppingstone 4-KB internal SRAM buffer can be used for another purpose after NAND flash booting. |
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